/*
 * JuiceFS, Copyright 2020 Juicedata, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package vfs

import (
	"syscall"

	"github.com/juicedata/juicefs/pkg/meta"
	"github.com/winfsp/cgofuse/fuse"
)

const O_ACCMODE = uint32(fuse.O_ACCMODE)
const F_UNLCK = 0x01

func (v *VFS) ChFlags(ctx Context, ino Ino, flags uint8) (err syscall.Errno) {
	defer func() {
		logit(ctx, "chflags", err, "(%d):%d", ino, flags)
	}()
	if IsSpecialNode(ino) {
		err = syscall.EPERM
		return
	}

	err = syscall.EINVAL
	var attr = &Attr{Flags: flags}

	if ctx.CheckPermission() {
		if err = v.Meta.CheckSetAttr(ctx, ino, meta.SetAttrFlag, *attr); err != 0 {
			return
		}
	}

	err = v.Meta.SetAttr(ctx, ino, meta.SetAttrFlag, 0, attr)
	return
}
